Longstone, registered in Dezhou, Shandong Province and headquartered in Beijing, is a leading supplier of raw materials in China. Based on the importing and exporting business framework concerning products like metallurgy and minerals, and welding materials which have been operated by Sunstone International since its foundation in 1998, Longstone has keeping forging ahead with developing new products and exploring new markets in the fields of metallurgy, refractory, welding consumables, chemical industry and building materials industry, etc.. And guided by the national policies, we have established our own culture: people foremost and with bold innovation; and also the strategic idea of market-oriented and customer focus. Meanwhile, we established, in succession, representative offices in Mid-east, and long-term strategic cooperation relationship with Korea, the Netherlands, the United States, Turkey, and India. Up till now, the company’s international business has covered more than 20 countries or regions.